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GOMMUTATOR FOR ELECTRIC GENERATORS. No. 389,184. Patented Sept. 4, 1888.

Fig.1

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a Q g g Wzlnesses: fnl enlor, l'WflM/ UNITED STATES PATENT Genres.

QTTO ZEOH, OF DETROIT, MICHIGAN,

ASSIGNOR OF ONE-HALF TO GUSTAV A. WINEMANN, OF SAME PLACE.

COMMUTATOR FOR ELECTREG GENERATORS.

SPECIFICATION forming part of Letters Patent No. 389,184, datedSeptember 4, 1888.

Application filed September 6, 1887. Serial No. 248,940. (No model.)

T aZZ whom it may concern:

Be it known that I, O'rro Zncn, a citizen of the United States, residingat Detroit, in the county of \Nayne and State of Michigan,

have invented certain new and useful Improvements in Oommutators, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention consists in certain new and to useful improvements inconstructing commutators; and the invention consists in the mechanicalproceeding and in its ultimate result in a finished commutator, all asmore fully hereinafter described.

1 In the drawings, Figure 1 is a perspective view of the cylindricalinsulating-body from which the commutator is formed. Fig. 2 is a similarview showing the body provided with a series of holes for the receptionof the com mutator-plates and the shaft. Fig. 3 is a perspective view ofone of the blanks, from which the commutator bars or plates are formed.Fig. at is an end view showing the commutator-blanks secured in theinsulated body. Fig. 5 is a side elevation of Fig. 4. Fig. 6 is a sideelevation of the commutator in its finished condition. T is acrosssection on line a: m in Fig. 6.

Figs. 1,, 2, 4, 5, and 6 illustrate the successivesteps taken in themanufacture of the commutator.

To begin with, a suitable insulating-body, A, of cylindrical shape anddesired size, is prepared. This isIthen provided with aseries 3 5 ofholes, a, parallel to its axis and concentric thereto, the operationbeing best performed by the use of a templet to mark all the holes fordrilling at once, theapertureb for the shaft being preferably drilled atthe same time.

Commutator-blanks cof the description shown in Fig. 3 are then driveninto the holes a, flush with one end of the commutator-body. Theseblanks are cut from phosphor-bronze, copper, or other suitable wire orround bar of such length to reach through the insulatingbody and projectsome distance at one end when secured in place. I preferably use wire orbar provided (in drawing it through the die) with a little feather orkey, (I, so that when secured in place it is firmly held against turningon its axis. Figs. 4 and 5 show the commutator at this stage of itsmanufacture. The next step in the operation is to turn off the face ofthe body of the insulator, and continuing such operation until thecommutatorbars are sufficiently cut away to form the desiredcontact-surface between the outer ends,

6 c,left standing. Preferably this cutting away both of theinsulating-body and the metallic bars is carried on until a little morethan onehalf of said bars remain embedded in the re maining body of theinsulator. If desired, in large commutators several rings may be leftstanding around the face of the commutator. The next steps ofelectrically connecting the commutator and securing it in place are donein the ordinary manner, and do not form a subject of my invention. Itonly includes the steps heretofore described.

It will be easily understood that this way of 0 manufacturing thecommutator has many advantages over the usual way of constructing suchcommutators, and wherein always great difficulty has been encountered insecuring the plates so firmly as to prevent them from becoming looseunder the action of the brushes. In my construction nothing short of thebreaking of the commutator can possibly detach the commutatonstrips; andnot alone this, but the process of manufacturing is so extremely simplethat on thisscore alone my invention is eminently economical and simple.As the commutatorplates cannot spring in turning,the result isabsolutely perfect. S5

Nhat I claim as my invention is- 1. A commutator composed of a singlecylinder of insulating material and provided with collars integrallyformed therewith, and of a series of metal rods provided with feathersor 0 keys and secured in a corresponding series of longitudinalperforations formed in the commutator, and the collars, substantially asdescribed.

2. A commutator composed of a single cylinder of insulating material andhaving two collars integrally formed therewith, and of a series of metalrods secured in. a correspond.

